<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="http://localhost:3000/course">全部</a>
                </li>
                <li
                  v-for="(item,index) in courseTypeParentList"
                  :key="index"
                  :class="{active:oneIndex==index}"
                >
                  <a :title="item.typeName" href="#" @click="searchOne(item.id,index)">{{item.typeName}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li
                  v-for="(item,index) in courseTypeList"
                  :key="index"
                  :class="{active:twoIndex==index}"
                >
                  <a :title="item.typeName" href="#" @click="searchTwo(item.id,index)">{{item.typeName}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear"></div>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">{{data.current}}</i>/
              <i class="c-666 f-fM">{{data.pages}}</i>
            </span>
          </section>
          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{'current bg-orange':sellCountSort!=''}">
                <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">
                  销量
                  <span :class="{hide:sellCountSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':createTimeSort!=''}">
                <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">
                  最新
                  <span :class="{hide:createTimeSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':priceSort!=''}">
                <a title="价格" href="javascript:void(0);" @click="searchPrice()">
                  价格&nbsp;
                  <span :class="{hide:priceSort==''}">↓</span>
                </a>
              </li>
            </ol>
          </section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section class="no-data-wrap" v-if="data.total==0">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
          </section>
          <!-- /无数据提示 结束-->
          <article v-if="data.total>0" class="comm-course-list">
            <ul class="of" id="bna">
              <li v-for="item in data.records" :key="item.id">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img :src="item.cover" class="img-responsive" :alt="item.title" />
                    <div class="cc-mask">
                      <a :href="'/course/'+item.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                    </div>
                  </section>
                  <h3 class="hLh30 txtOf mt10">
                    <a
                      :href="'/course/'+item.id"
                      :title="item.title"
                      class="course-title fsize18 c-333"
                    >{{item.title}}</a>
                  </h3>
                  <section class="mt10 hLh20 of">
                    <span v-if="Number(item.price) === 0" class="fr jgTag bg-green">
                      <i class="c-fff fsize12 f-fA">免费</i>
                    </span>
                    <span class="fr jgTag bg-green" v-else>
                        <i class="c-fff fsize12 f-fA"> ￥{{item.price}}</i>
                      </span>
                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">{{item.sellCount}}人学习</i>
                      |
                      <i class="c-999 f-fA">{{item.viewCount}}浏览量</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear"></div>
          </article>
        </div>
        <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="首页"
              @click.prevent="gotoPage(1)"
            >首</a>
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="前一页"
              @click.prevent="gotoPage(data.current-1)"
            >&lt;</a>
            <a
              v-for="page in data.pages"
              :key="page"
              :class="{current: data.current == page, undisable: data.current == page}"
              :title="'第'+page+'页'"
              href="#"
              @click.prevent="gotoPage(page)"
            >{{ page }}</a>
            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="后一页"
              @click.prevent="gotoPage(data.current+1)"
            >&gt;</a>
            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="末页"
              @click.prevent="gotoPage(data.pages)"
            >末</a>
            <div class="clear" />
          </div>
        </div>
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>
<script>
import courseApi from "@/api/course";

export default {
  data() {
    return {
      page: 1, //当前页
      data: {}, //课程列表
      courseTypeParentList: [], // 一级分类列表
      courseTypeList: [], // 二级分类列表

      searchObj: {}, // 查询表单对象

      oneIndex: -1,
      twoIndex: -1,
      sellCountSort: "",
      createTimeSort: "",
      priceSort: ""
    };
  },
  created() {
    //课程第一次查询
    this.initCourseFirst();
    //一级分类显示
    this.initSubject();
  },
  methods: {
    //1 查询第一页数据
    initCourseFirst() {
      this.gotoPage(1);
    },

    //2 查询所有一级分类
    initSubject() {
      courseApi.getAllSubject().then(response => {
        this.courseTypeParentList = response.data.data.list;
      });
    },

    //3 分页切换的方法
    gotoPage(page) {
      courseApi.getCourseList(page, 8, this.searchObj).then(response => {
        this.data = response.data.data;
        console.log("gotoPage（）方法")
        console.log(this.data)
      });
    },

    //4 点击某个一级分类，查询对应二级分类
    searchOne(courseTypeParentId, index) {
      //把传递index值赋值给oneIndex,为了active样式生效
      this.oneIndex = index;

      this.twoIndex = -1;
      this.searchObj.courseTypeParentId = "";
      this.courseTypeList = [];

      //把一级分类点击id值，赋值给searchObj
      this.searchObj.courseTypeParentId = courseTypeParentId;
      //点击某个一级分类进行条件查询
      this.gotoPage(1);

      //拿着点击一级分类id 和 所有一级分类id进行比较，
      //如果id相同，从一级分类里面获取对应的二级分类
      for (let i = 0; i < this.courseTypeParentList.length; i++) {
        //获取每个一级分类
        var oneSubject = this.courseTypeParentList[i];
        //比较id是否相同
        if (courseTypeParentId == oneSubject.id) {
          //从一级分类里面获取对应的二级分类
          this.courseTypeList = oneSubject.children;
        }
      }
    },

    //5 点击某个二级分类实现查询
    searchTwo(courseTypeId, index) {
      //把index赋值,为了样式生效
      this.twoIndex = index;
      //把二级分类点击id值，赋值给searchObj
      this.searchObj.courseTypeId = courseTypeId;
      //点击某个二级分类进行条件查询
      this.gotoPage(1);
    },

    //6 根据销量排序
    searchBuyCount() {
      //设置对应变量值，为了样式生效
      this.sellCountSort = "1";
      this.createTimeSort = "";
      this.priceSort = "";

      //把值赋值到searchObj
      this.searchObj.sellCountSort = this.sellCountSort;
      this.searchObj.createTimeSort = this.createTimeSort;
      this.searchObj.priceSort = this.priceSort;

      //调用方法查询
      this.gotoPage(1);
    },

    //7 最新排序
    searchGmtCreate() {
      //设置对应变量值，为了样式生效
      this.sellCountSort = "";
      this.createTimeSort = "1";
      this.priceSort = "";

      //把值赋值到searchObj
      this.searchObj.sellCountSort = this.sellCountSort;
      this.searchObj.createTimeSort = this.createTimeSort;
      this.searchObj.priceSort = this.priceSort;

      //调用方法查询
      this.gotoPage(1);
    },

    //8 价格排序
    searchPrice() {
      //设置对应变量值，为了样式生效
      this.sellCountSort = "";
      this.createTimeSort = "";
      this.priceSort = "1";

      //把值赋值到searchObj
      this.searchObj.sellCountSort = this.sellCountSort;
      this.searchObj.createTimeSort = this.createTimeSort;
      this.searchObj.priceSort = this.priceSort;

      //调用方法查询
      this.gotoPage(1);
    }
  }
};
</script>
<style scoped>
.active {
  background: #bdbdbd;
}
.hide {
  display: none;
}
.show {
  display: block;
}
</style>